mm: introduce include/linux/pgtable.h

The include/linux/pgtable.h is going to be the home of generic page table
manipulation functions.

Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and
make the latter include asm/pgtable.h.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 1323 deletions

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 3a7871130112..8b1e020e9a03 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -972,7 +972,7 @@ static inline void iounmap(void __iomem *addr)
 }
 #endif
 #elif defined(CONFIG_GENERIC_IOREMAP)
-#include <asm/pgtable.h>
+#include <linux/pgtable.h>
 
 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot);
 void iounmap(volatile void __iomem *addr);
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
deleted file mode 100644
index 0a9329656ae6..000000000000
--- a/include/asm-generic/pgtable.h
+++ /dev/null
@@ -1,1322 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_GENERIC_PGTABLE_H
-#define _ASM_GENERIC_PGTABLE_H
-
-#include <linux/pfn.h>
-
-#ifndef __ASSEMBLY__
-#ifdef CONFIG_MMU
-
-#include <linux/mm_types.h>
-#include <linux/bug.h>
-#include <linux/errno.h>
-#include <asm-generic/pgtable_uffd.h>
-
-#if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \
-	defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS
-#error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{P4D,PUD,PMD}_FOLDED
-#endif
-
-/*
- * On almost all architectures and configurations, 0 can be used as the
- * upper ceiling to free_pgtables(): on many architectures it has the same
- * effect as using TASK_SIZE.  However, there is one configuration which
- * must impose a more careful limit, to avoid freeing kernel pgtables.
- */
-#ifndef USER_PGTABLES_CEILING
-#define USER_PGTABLES_CEILING	0UL
-#endif
-
-#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
-extern int ptep_set_access_flags(struct vm_area_struct *vma,
-				 unsigned long address, pte_t *ptep,
-				 pte_t entry, int dirty);
-#endif
-
-#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-extern int pmdp_set_access_flags(struct vm_area_struct *vma,
-				 unsigned long address, pmd_t *pmdp,
-				 pmd_t entry, int dirty);
-extern int pudp_set_access_flags(struct vm_area_struct *vma,
-				 unsigned long address, pud_t *pudp,
-				 pud_t entry, int dirty);
-#else
-static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
-					unsigned long address, pmd_t *pmdp,
-					pmd_t entry, int dirty)
-{
-	BUILD_BUG();
-	return 0;
-}
-static inline int pudp_set_access_flags(struct vm_area_struct *vma,
-					unsigned long address, pud_t *pudp,
-					pud_t entry, int dirty)
-{
-	BUILD_BUG();
-	return 0;
-}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#endif
-
-#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
-					    unsigned long address,
-					    pte_t *ptep)
-{
-	pte_t pte = *ptep;
-	int r = 1;
-	if (!pte_young(pte))
-		r = 0;
-	else
-		set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte));
-	return r;
-}
-#endif
-
-#ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-					    unsigned long address,
-					    pmd_t *pmdp)
-{
-	pmd_t pmd = *pmdp;
-	int r = 1;
-	if (!pmd_young(pmd))
-		r = 0;
-	else
-		set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
-	return r;
-}
-#else
-static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-					    unsigned long address,
-					    pmd_t *pmdp)
-{
-	BUILD_BUG();
-	return 0;
-}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#endif
-
-#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-int ptep_clear_flush_young(struct vm_area_struct *vma,
-			   unsigned long address, pte_t *ptep);
-#endif
-
-#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
-				  unsigned long address, pmd_t *pmdp);
-#else
-/*
- * Despite relevant to THP only, this API is called from generic rmap code
- * under PageTransHuge(), hence needs a dummy implementation for !THP
- */
-static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
-					 unsigned long address, pmd_t *pmdp)
-{
-	BUILD_BUG();
-	return 0;
-}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#endif
-
-#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
-static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
-				       unsigned long address,
-				       pte_t *ptep)
-{
-	pte_t pte = *ptep;
-	pte_clear(mm, address, ptep);
-	return pte;
-}
-#endif
-
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
-static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
-					    unsigned long address,
-					    pmd_t *pmdp)
-{
-	pmd_t pmd = *pmdp;
-	pmd_clear(pmdp);
-	return pmd;
-}
-#endif /* __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR */
-#ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
-static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
-					    unsigned long address,
-					    pud_t *pudp)
-{
-	pud_t pud = *pudp;
-
-	pud_clear(pudp);
-	return pud;
-}
-#endif /* __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR */
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-#ifndef __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
-static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma,
-					    unsigned long address, pmd_t *pmdp,
-					    int full)
-{
-	return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
-}
-#endif
-
-#ifndef __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR_FULL
-static inline pud_t pudp_huge_get_and_clear_full(struct mm_struct *mm,
-					    unsigned long address, pud_t *pudp,
-					    int full)
-{
-	return pudp_huge_get_and_clear(mm, address, pudp);
-}
-#endif
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-
-#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
-static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
-					    unsigned long address, pte_t *ptep,
-					    int full)
-{
-	pte_t pte;
-	pte = ptep_get_and_clear(mm, address, ptep);
-	return pte;
-}
-#endif
-
-
-/*
- * If two threads concurrently fault at the same page, the thread that
- * won the race updates the PTE and its local TLB/Cache. The other thread
- * gives up, simply does nothing, and continues; on architectures where
- * software can update TLB,  local TLB can be updated here to avoid next page
- * fault. This function updates TLB only, do nothing with cache or others.
- * It is the difference with function update_mmu_cache.
- */
-#ifndef __HAVE_ARCH_UPDATE_MMU_TLB
-static inline void update_mmu_tlb(struct vm_area_struct *vma,
-				unsigned long address, pte_t *ptep)
-{
-}
-#define __HAVE_ARCH_UPDATE_MMU_TLB
-#endif
-
-/*
- * Some architectures may be able to avoid expensive synchronization
- * primitives when modifications are made to PTE's which are already
- * not present, or in the process of an address space destruction.
- */
-#ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL
-static inline void pte_clear_not_present_full(struct mm_struct *mm,
-					      unsigned long address,
-					      pte_t *ptep,
-					      int full)
-{
-	pte_clear(mm, address, ptep);
-}
-#endif
-
-#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
-extern pte_t ptep_clear_flush(struct vm_area_struct *vma,
-			      unsigned long address,
-			      pte_t *ptep);
-#endif
-
-#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
-extern pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
-			      unsigned long address,
-			      pmd_t *pmdp);
-extern pud_t pudp_huge_clear_flush(struct vm_area_struct *vma,
-			      unsigned long address,
-			      pud_t *pudp);
-#endif
-
-#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
-struct mm_struct;
-static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
-{
-	pte_t old_pte = *ptep;
-	set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
-}
-#endif
-
-/*
- * On some architectures hardware does not set page access bit when accessing
- * memory page, it is responsibilty of software setting this bit. It brings
- * out extra page fault penalty to track page access bit. For optimization page
- * access bit can be set during all page fault flow on these arches.
- * To be differentiate with macro pte_mkyoung, this macro is used on platforms
- * where software maintains page access bit.
- */
-#ifndef pte_sw_mkyoung
-static inline pte_t pte_sw_mkyoung(pte_t pte)
-{
-	return pte;
-}
-#define pte_sw_mkyoung	pte_sw_mkyoung
-#endif
-
-#ifndef pte_savedwrite
-#define pte_savedwrite pte_write
-#endif
-
-#ifndef pte_mk_savedwrite
-#define pte_mk_savedwrite pte_mkwrite
-#endif
-
-#ifndef pte_clear_savedwrite
-#define pte_clear_savedwrite pte_wrprotect
-#endif
-
-#ifndef pmd_savedwrite
-#define pmd_savedwrite pmd_write
-#endif
-
-#ifndef pmd_mk_savedwrite
-#define pmd_mk_savedwrite pmd_mkwrite
-#endif
-
-#ifndef pmd_clear_savedwrite
-#define pmd_clear_savedwrite pmd_wrprotect
-#endif
-
-#ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static inline void pmdp_set_wrprotect(struct mm_struct *mm,
-				      unsigned long address, pmd_t *pmdp)
-{
-	pmd_t old_pmd = *pmdp;
-	set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
-}
-#else
-static inline void pmdp_set_wrprotect(struct mm_struct *mm,
-				      unsigned long address, pmd_t *pmdp)
-{
-	BUILD_BUG();
-}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#endif
-#ifndef __HAVE_ARCH_PUDP_SET_WRPROTECT
-#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
-static inline void pudp_set_wrprotect(struct mm_struct *mm,
-				      unsigned long address, pud_t *pudp)
-{
-	pud_t old_pud = *pudp;
-
-	set_pud_at(mm, address, pudp, pud_wrprotect(old_pud));
-}
-#else
-static inline void pudp_set_wrprotect(struct mm_struct *mm,
-				      unsigned long address, pud_t *pudp)
-{
-	BUILD_BUG();
-}
-#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
-#endif
-
-#ifndef pmdp_collapse_flush
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
-				 unsigned long address, pmd_t *pmdp);
-#else
-static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
-					unsigned long address,
-					pmd_t *pmdp)
-{
-	BUILD_BUG();
-	return *pmdp;
-}
-#define pmdp_collapse_flush pmdp_collapse_flush
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#endif
-
-#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
-extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
-				       pgtable_t pgtable);
-#endif
-
-#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
-extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
-#endif
-
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-/*
- * This is an implementation of pmdp_establish() that is only suitable for an
- * architecture that doesn't have hardware dirty/accessed bits. In this case we
- * can't race with CPU which sets these bits and non-atomic aproach is fine.
- */
-static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma,
-		unsigned long address, pmd_t *pmdp, pmd_t pmd)
-{
-	pmd_t old_pmd = *pmdp;
-	set_pmd_at(vma->vm_mm, address, pmdp, pmd);
-	return old_pmd;
-}
-#endif
-
-#ifndef __HAVE_ARCH_PMDP_INVALIDATE
-extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
-			    pmd_t *pmdp);
-#endif
-
-#ifndef __HAVE_ARCH_PTE_SAME
-static inline int pte_same(pte_t pte_a, pte_t pte_b)
-{
-	return pte_val(pte_a) == pte_val(pte_b);
-}
-#endif
-
-#ifndef __HAVE_ARCH_PTE_UNUSED
-/*
- * Some architectures provide facilities to virtualization guests
- * so that they can flag allocated pages as unused. This allows the
- * host to transparently reclaim unused pages. This function returns
- * whether the pte's page is unused.
- */
-static inline int pte_unused(pte_t pte)
-{
-	return 0;
-}
-#endif
-
-#ifndef pte_access_permitted
-#define pte_access_permitted(pte, write) \
-	(pte_present(pte) && (!(write) || pte_write(pte)))
-#endif
-
-#ifndef pmd_access_permitted
-#define pmd_access_permitted(pmd, write) \
-	(pmd_present(pmd) && (!(write) || pmd_write(pmd)))
-#endif
-
-#ifndef pud_access_permitted
-#define pud_access_permitted(pud, write) \
-	(pud_present(pud) && (!(write) || pud_write(pud)))
-#endif
-
-#ifndef p4d_access_permitted
-#define p4d_access_permitted(p4d, write) \
-	(p4d_present(p4d) && (!(write) || p4d_write(p4d)))
-#endif
-
-#ifndef pgd_access_permitted
-#define pgd_access_permitted(pgd, write) \
-	(pgd_present(pgd) && (!(write) || pgd_write(pgd)))
-#endif
-
-#ifndef __HAVE_ARCH_PMD_SAME
-static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
-{
-	return pmd_val(pmd_a) == pmd_val(pmd_b);
-}
-
-static inline int pud_same(pud_t pud_a, pud_t pud_b)
-{
-	return pud_val(pud_a) == pud_val(pud_b);
-}
-#endif
-
-#ifndef __HAVE_ARCH_P4D_SAME
-static inline int p4d_same(p4d_t p4d_a, p4d_t p4d_b)
-{
-	return p4d_val(p4d_a) == p4d_val(p4d_b);
-}
-#endif
-
-#ifndef __HAVE_ARCH_PGD_SAME
-static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b)
-{
-	return pgd_val(pgd_a) == pgd_val(pgd_b);
-}
-#endif
-
-/*
- * Use set_p*_safe(), and elide TLB flushing, when confident that *no*
- * TLB flush will be required as a result of the "set". For example, use
- * in scenarios where it is known ahead of time that the routine is
- * setting non-present entries, or re-setting an existing entry to the
- * same value. Otherwise, use the typical "set" helpers and flush the
- * TLB.
- */
-#define set_pte_safe(ptep, pte) \
-({ \
-	WARN_ON_ONCE(pte_present(*ptep) && !pte_same(*ptep, pte)); \
-	set_pte(ptep, pte); \
-})
-
-#define set_pmd_safe(pmdp, pmd) \
-({ \
-	WARN_ON_ONCE(pmd_present(*pmdp) && !pmd_same(*pmdp, pmd)); \
-	set_pmd(pmdp, pmd); \
-})
-
-#define set_pud_safe(pudp, pud) \
-({ \
-	WARN_ON_ONCE(pud_present(*pudp) && !pud_same(*pudp, pud)); \
-	set_pud(pudp, pud); \
-})
-
-#define set_p4d_safe(p4dp, p4d) \
-({ \
-	WARN_ON_ONCE(p4d_present(*p4dp) && !p4d_same(*p4dp, p4d)); \
-	set_p4d(p4dp, p4d); \
-})
-
-#define set_pgd_safe(pgdp, pgd) \
-({ \
-	WARN_ON_ONCE(pgd_present(*pgdp) && !pgd_same(*pgdp, pgd)); \
-	set_pgd(pgdp, pgd); \
-})
-
-#ifndef __HAVE_ARCH_DO_SWAP_PAGE
-/*
- * Some architectures support metadata associated with a page. When a
- * page is being swapped out, this metadata must be saved so it can be
- * restored when the page is swapped back in. SPARC M7 and newer
- * processors support an ADI (Application Data Integrity) tag for the
- * page as metadata for the page. arch_do_swap_page() can restore this
- * metadata when a page is swapped back in.
- */
-static inline void arch_do_swap_page(struct mm_struct *mm,
-				     struct vm_area_struct *vma,
-				     unsigned long addr,
-				     pte_t pte, pte_t oldpte)
-{
-
-}
-#endif
-
-#ifndef __HAVE_ARCH_UNMAP_ONE
-/*
- * Some architectures support metadata associated with a page. When a
- * page is being swapped out, this metadata must be saved so it can be
- * restored when the page is swapped back in. SPARC M7 and newer
- * processors support an ADI (Application Data Integrity) tag for the
- * page as metadata for the page. arch_unmap_one() can save this
- * metadata on a swap-out of a page.
- */
-static inline int arch_unmap_one(struct mm_struct *mm,
-				  struct vm_area_struct *vma,
-				  unsigned long addr,
-				  pte_t orig_pte)
-{
-	return 0;
-}
-#endif
-
-#ifndef __HAVE_ARCH_PGD_OFFSET_GATE
-#define pgd_offset_gate(mm, addr)	pgd_offset(mm, addr)
-#endif
-
-#ifndef __HAVE_ARCH_MOVE_PTE
-#define move_pte(pte, prot, old_addr, new_addr)	(pte)
-#endif
-
-#ifndef pte_accessible
-# define pte_accessible(mm, pte)	((void)(pte), 1)
-#endif
-
-#ifndef flush_tlb_fix_spurious_fault
-#define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address)
-#endif
-
-#ifndef pgprot_nx
-#define pgprot_nx(prot)	(prot)
-#endif
-
-#ifndef pgprot_noncached
-#define pgprot_noncached(prot)	(prot)
-#endif
-
-#ifndef pgprot_writecombine
-#define pgprot_writecombine pgprot_noncached
-#endif
-
-#ifndef pgprot_writethrough
-#define pgprot_writethrough pgprot_noncached
-#endif
-
-#ifndef pgprot_device
-#define pgprot_device pgprot_noncached
-#endif
-
-#ifndef pgprot_modify
-#define pgprot_modify pgprot_modify
-static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
-{
-	if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot)))
-		newprot = pgprot_noncached(newprot);
-	if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot)))
-		newprot = pgprot_writecombine(newprot);
-	if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot)))
-		newprot = pgprot_device(newprot);
-	return newprot;
-}
-#endif
-
-/*
- * When walking page tables, get the address of the next boundary,
- * or the end address of the range if that comes earlier.  Although no
- * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
- */
-
-#define pgd_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;	\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-
-#ifndef p4d_addr_end
-#define p4d_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + P4D_SIZE) & P4D_MASK;	\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-#endif
-
-#ifndef pud_addr_end
-#define pud_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK;	\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-#endif
-
-#ifndef pmd_addr_end
-#define pmd_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK;	\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-#endif
-
-/*
- * When walking page tables, we usually want to skip any p?d_none entries;
- * and any p?d_bad entries - reporting the error before resetting to none.
- * Do the tests inline, but report and clear the bad entry in mm/memory.c.
- */
-void pgd_clear_bad(pgd_t *);
-
-#ifndef __PAGETABLE_P4D_FOLDED
-void p4d_clear_bad(p4d_t *);
-#else
-#define p4d_clear_bad(p4d)        do { } while (0)
-#endif
-
-#ifndef __PAGETABLE_PUD_FOLDED
-void pud_clear_bad(pud_t *);
-#else
-#define pud_clear_bad(p4d)        do { } while (0)
-#endif
-
-void pmd_clear_bad(pmd_t *);
-
-static inline int pgd_none_or_clear_bad(pgd_t *pgd)
-{
-	if (pgd_none(*pgd))
-		return 1;
-	if (unlikely(pgd_bad(*pgd))) {
-		pgd_clear_bad(pgd);
-		return 1;
-	}
-	return 0;
-}
-
-static inline int p4d_none_or_clear_bad(p4d_t *p4d)
-{
-	if (p4d_none(*p4d))
-		return 1;
-	if (unlikely(p4d_bad(*p4d))) {
-		p4d_clear_bad(p4d);
-		return 1;
-	}
-	return 0;
-}
-
-static inline int pud_none_or_clear_bad(pud_t *pud)
-{
-	if (pud_none(*pud))
-		return 1;
-	if (unlikely(pud_bad(*pud))) {
-		pud_clear_bad(pud);
-		return 1;
-	}
-	return 0;
-}
-
-static inline int pmd_none_or_clear_bad(pmd_t *pmd)
-{
-	if (pmd_none(*pmd))
-		return 1;
-	if (unlikely(pmd_bad(*pmd))) {
-		pmd_clear_bad(pmd);
-		return 1;
-	}
-	return 0;
-}
-
-static inline pte_t __ptep_modify_prot_start(struct vm_area_struct *vma,
-					     unsigned long addr,
-					     pte_t *ptep)
-{
-	/*
-	 * Get the current pte state, but zero it out to make it
-	 * non-present, preventing the hardware from asynchronously
-	 * updating it.
-	 */
-	return ptep_get_and_clear(vma->vm_mm, addr, ptep);
-}
-
-static inline void __ptep_modify_prot_commit(struct vm_area_struct *vma,
-					     unsigned long addr,
-					     pte_t *ptep, pte_t pte)
-{
-	/*
-	 * The pte is non-present, so there's no hardware state to
-	 * preserve.
-	 */
-	set_pte_at(vma->vm_mm, addr, ptep, pte);
-}
-
-#ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
-/*
- * Start a pte protection read-modify-write transaction, which
- * protects against asynchronous hardware modifications to the pte.
- * The intention is not to prevent the hardware from making pte
- * updates, but to prevent any updates it may make from being lost.
- *
- * This does not protect against other software modifications of the
- * pte; the appropriate pte lock must be held over the transation.
- *
- * Note that this interface is intended to be batchable, meaning that
- * ptep_modify_prot_commit may not actually update the pte, but merely
- * queue the update to be done at some later time.  The update must be
- * actually committed before the pte lock is released, however.
- */
-static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma,
-					   unsigned long addr,
-					   pte_t *ptep)
-{
-	return __ptep_modify_prot_start(vma, addr, ptep);
-}
-
-/*
- * Commit an update to a pte, leaving any hardware-controlled bits in
- * the PTE unmodified.
- */
-static inline void ptep_modify_prot_commit(struct vm_area_struct *vma,
-					   unsigned long addr,
-					   pte_t *ptep, pte_t old_pte, pte_t pte)
-{
-	__ptep_modify_prot_commit(vma, addr, ptep, pte);
-}
-#endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */
-#endif /* CONFIG_MMU */
-
-/*
- * No-op macros that just return the current protection value. Defined here
- * because these macros can be used used even if CONFIG_MMU is not defined.
- */
-#ifndef pgprot_encrypted
-#define pgprot_encrypted(prot)	(prot)
-#endif
-
-#ifndef pgprot_decrypted
-#define pgprot_decrypted(prot)	(prot)
-#endif
-
-/*
- * A facility to provide lazy MMU batching.  This allows PTE updates and
- * page invalidations to be delayed until a call to leave lazy MMU mode
- * is issued.  Some architectures may benefit from doing this, and it is
- * beneficial for both shadow and direct mode hypervisors, which may batch
- * the PTE updates which happen during this window.  Note that using this
- * interface requires that read hazards be removed from the code.  A read
- * hazard could result in the direct mode hypervisor case, since the actual
- * write to the page tables may not yet have taken place, so reads though
- * a raw PTE pointer after it has been modified are not guaranteed to be
- * up to date.  This mode can only be entered and left under the protection of
- * the page table locks for all page tables which may be modified.  In the UP
- * case, this is required so that preemption is disabled, and in the SMP case,
- * it must synchronize the delayed page table writes properly on other CPUs.
- */
-#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE
-#define arch_enter_lazy_mmu_mode()	do {} while (0)
-#define arch_leave_lazy_mmu_mode()	do {} while (0)
-#define arch_flush_lazy_mmu_mode()	do {} while (0)
-#endif
-
-/*
- * A facility to provide batching of the reload of page tables and
- * other process state with the actual context switch code for
- * paravirtualized guests.  By convention, only one of the batched
- * update (lazy) modes (CPU, MMU) should be active at any given time,
- * entry should never be nested, and entry and exits should always be
- * paired.  This is for sanity of maintaining and reasoning about the
- * kernel code.  In this case, the exit (end of the context switch) is
- * in architecture-specific code, and so doesn't need a generic
- * definition.
- */
-#ifndef __HAVE_ARCH_START_CONTEXT_SWITCH
-#define arch_start_context_switch(prev)	do {} while (0)
-#endif
-
-#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
-#ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION
-static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
-{
-	return pmd;
-}
-
-static inline int pmd_swp_soft_dirty(pmd_t pmd)
-{
-	return 0;
-}
-
-static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
-{
-	return pmd;
-}
-#endif
-#else /* !CONFIG_HAVE_ARCH_SOFT_DIRTY */
-static inline int pte_soft_dirty(pte_t pte)
-{
-	return 0;
-}
-
-static inline int pmd_soft_dirty(pmd_t pmd)
-{
-	return 0;
-}
-
-static inline pte_t pte_mksoft_dirty(pte_t pte)
-{
-	return pte;
-}
-
-static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
-{
-	return pmd;
-}
-
-static inline pte_t pte_clear_soft_dirty(pte_t pte)
-{
-	return pte;
-}
-
-static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
-{
-	return pmd;
-}
-
-static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
-{
-	return pte;
-}
-
-static inline int pte_swp_soft_dirty(pte_t pte)
-{
-	return 0;
-}
-
-static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
-{
-	return pte;
-}
-
-static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
-{
-	return pmd;
-}
-
-static inline int pmd_swp_soft_dirty(pmd_t pmd)
-{
-	return 0;
-}
-
-static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
-{
-	return pmd;
-}
-#endif
-
-#ifndef __HAVE_PFNMAP_TRACKING
-/*
- * Interfaces that can be used by architecture code to keep track of
- * memory type of pfn mappings specified by the remap_pfn_range,
- * vmf_insert_pfn.
- */
-
-/*
- * track_pfn_remap is called when a _new_ pfn mapping is being established
- * by remap_pfn_range() for physical range indicated by pfn and size.
- */
-static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot,
-				  unsigned long pfn, unsigned long addr,
-				  unsigned long size)
-{
-	return 0;
-}
-
-/*
- * track_pfn_insert is called when a _new_ single pfn is established
- * by vmf_insert_pfn().
- */
-static inline void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
-				    pfn_t pfn)
-{
-}
-
-/*
- * track_pfn_copy is called when vma that is covering the pfnmap gets
- * copied through copy_page_range().
- */
-static inline int track_pfn_copy(struct vm_area_struct *vma)
-{
-	return 0;
-}
-
-/*
- * untrack_pfn is called while unmapping a pfnmap for a region.
- * untrack can be called for a specific region indicated by pfn and size or
- * can be for the entire vma (in which case pfn, size are zero).
- */
-static inline void untrack_pfn(struct vm_area_struct *vma,
-			       unsigned long pfn, unsigned long size)
-{
-}
-
-/*
- * untrack_pfn_moved is called while mremapping a pfnmap for a new region.
- */
-static inline void untrack_pfn_moved(struct vm_area_struct *vma)
-{
-}
-#else
-extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot,
-			   unsigned long pfn, unsigned long addr,
-			   unsigned long size);
-extern void track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot,
-			     pfn_t pfn);
-extern int track_pfn_copy(struct vm_area_struct *vma);
-extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
-			unsigned long size);
-extern void untrack_pfn_moved(struct vm_area_struct *vma);
-#endif
-
-#ifdef __HAVE_COLOR_ZERO_PAGE
-static inline int is_zero_pfn(unsigned long pfn)
-{
-	extern unsigned long zero_pfn;
-	unsigned long offset_from_zero_pfn = pfn - zero_pfn;
-	return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
-}
-
-#define my_zero_pfn(addr)	page_to_pfn(ZERO_PAGE(addr))
-
-#else
-static inline int is_zero_pfn(unsigned long pfn)
-{
-	extern unsigned long zero_pfn;
-	return pfn == zero_pfn;
-}
-
-static inline unsigned long my_zero_pfn(unsigned long addr)
-{
-	extern unsigned long zero_pfn;
-	return zero_pfn;
-}
-#endif
-
-#ifdef CONFIG_MMU
-
-#ifndef CONFIG_TRANSPARENT_HUGEPAGE
-static inline int pmd_trans_huge(pmd_t pmd)
-{
-	return 0;
-}
-#ifndef pmd_write
-static inline int pmd_write(pmd_t pmd)
-{
-	BUG();
-	return 0;
-}
-#endif /* pmd_write */
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-
-#ifndef pud_write
-static inline int pud_write(pud_t pud)
-{
-	BUG();
-	return 0;
-}
-#endif /* pud_write */
-
-#if !defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
-static inline int pmd_devmap(pmd_t pmd)
-{
-	return 0;
-}
-static inline int pud_devmap(pud_t pud)
-{
-	return 0;
-}
-static inline int pgd_devmap(pgd_t pgd)
-{
-	return 0;
-}
-#endif
-
-#if !defined(CONFIG_TRANSPARENT_HUGEPAGE) || \
-	(defined(CONFIG_TRANSPARENT_HUGEPAGE) && \
-	 !defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
-static inline int pud_trans_huge(pud_t pud)
-{
-	return 0;
-}
-#endif
-
-/* See pmd_none_or_trans_huge_or_clear_bad for discussion. */
-static inline int pud_none_or_trans_huge_or_dev_or_clear_bad(pud_t *pud)
-{
-	pud_t pudval = READ_ONCE(*pud);
-
-	if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval))
-		return 1;
-	if (unlikely(pud_bad(pudval))) {
-		pud_clear_bad(pud);
-		return 1;
-	}
-	return 0;
-}
-
-/* See pmd_trans_unstable for discussion. */
-static inline int pud_trans_unstable(pud_t *pud)
-{
-#if defined(CONFIG_TRANSPARENT_HUGEPAGE) &&			\
-	defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
-	return pud_none_or_trans_huge_or_dev_or_clear_bad(pud);
-#else
-	return 0;
-#endif
-}
-
-#ifndef pmd_read_atomic
-static inline pmd_t pmd_read_atomic(pmd_t *pmdp)
-{
-	/*
-	 * Depend on compiler for an atomic pmd read. NOTE: this is
-	 * only going to work, if the pmdval_t isn't larger than
-	 * an unsigned long.
-	 */
-	return *pmdp;
-}
-#endif
-
-#ifndef arch_needs_pgtable_deposit
-#define arch_needs_pgtable_deposit() (false)
-#endif
-/*
- * This function is meant to be used by sites walking pagetables with
- * the mmap_sem hold in read mode to protect against MADV_DONTNEED and
- * transhuge page faults. MADV_DONTNEED can convert a transhuge pmd
- * into a null pmd and the transhuge page fault can convert a null pmd
- * into an hugepmd or into a regular pmd (if the hugepage allocation
- * fails). While holding the mmap_sem in read mode the pmd becomes
- * stable and stops changing under us only if it's not null and not a
- * transhuge pmd. When those races occurs and this function makes a
- * difference vs the standard pmd_none_or_clear_bad, the result is
- * undefined so behaving like if the pmd was none is safe (because it
- * can return none anyway). The compiler level barrier() is critically
- * important to compute the two checks atomically on the same pmdval.
- *
- * For 32bit kernels with a 64bit large pmd_t this automatically takes
- * care of reading the pmd atomically to avoid SMP race conditions
- * against pmd_populate() when the mmap_sem is hold for reading by the
- * caller (a special atomic read not done by "gcc" as in the generic
- * version above, is also needed when THP is disabled because the page
- * fault can populate the pmd from under us).
- */
-static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd)
-{
-	pmd_t pmdval = pmd_read_atomic(pmd);
-	/*
-	 * The barrier will stabilize the pmdval in a register or on
-	 * the stack so that it will stop changing under the code.
-	 *
-	 * When CONFIG_TRANSPARENT_HUGEPAGE=y on x86 32bit PAE,
-	 * pmd_read_atomic is allowed to return a not atomic pmdval
-	 * (for example pointing to an hugepage that has never been
-	 * mapped in the pmd). The below checks will only care about
-	 * the low part of the pmd with 32bit PAE x86 anyway, with the
-	 * exception of pmd_none(). So the important thing is that if
-	 * the low part of the pmd is found null, the high part will
-	 * be also null or the pmd_none() check below would be
-	 * confused.
-	 */
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	barrier();
-#endif
-	/*
-	 * !pmd_present() checks for pmd migration entries
-	 *
-	 * The complete check uses is_pmd_migration_entry() in linux/swapops.h
-	 * But using that requires moving current function and pmd_trans_unstable()
-	 * to linux/swapops.h to resovle dependency, which is too much code move.
-	 *
-	 * !pmd_present() is equivalent to is_pmd_migration_entry() currently,
-	 * because !pmd_present() pages can only be under migration not swapped
-	 * out.
-	 *
-	 * pmd_none() is preseved for future condition checks on pmd migration
-	 * entries and not confusing with this function name, although it is
-	 * redundant with !pmd_present().
-	 */
-	if (pmd_none(pmdval) || pmd_trans_huge(pmdval) ||
-		(IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION) && !pmd_present(pmdval)))
-		return 1;
-	if (unlikely(pmd_bad(pmdval))) {
-		pmd_clear_bad(pmd);
-		return 1;
-	}
-	return 0;
-}
-
-/*
- * This is a noop if Transparent Hugepage Support is not built into
- * the kernel. Otherwise it is equivalent to
- * pmd_none_or_trans_huge_or_clear_bad(), and shall only be called in
- * places that already verified the pmd is not none and they want to
- * walk ptes while holding the mmap sem in read mode (write mode don't
- * need this). If THP is not enabled, the pmd can't go away under the
- * code even if MADV_DONTNEED runs, but if THP is enabled we need to
- * run a pmd_trans_unstable before walking the ptes after
- * split_huge_pmd returns (because it may have run when the pmd become
- * null, but then a page fault can map in a THP and not a regular page).
- */
-static inline int pmd_trans_unstable(pmd_t *pmd)
-{
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	return pmd_none_or_trans_huge_or_clear_bad(pmd);
-#else
-	return 0;
-#endif
-}
-
-#ifndef CONFIG_NUMA_BALANCING
-/*
- * Technically a PTE can be PROTNONE even when not doing NUMA balancing but
- * the only case the kernel cares is for NUMA balancing and is only ever set
- * when the VMA is accessible. For PROT_NONE VMAs, the PTEs are not marked
- * _PAGE_PROTNONE so by by default, implement the helper as "always no". It
- * is the responsibility of the caller to distinguish between PROT_NONE
- * protections and NUMA hinting fault protections.
- */
-static inline int pte_protnone(pte_t pte)
-{
-	return 0;
-}
-
-static inline int pmd_protnone(pmd_t pmd)
-{
-	return 0;
-}
-#endif /* CONFIG_NUMA_BALANCING */
-
-#endif /* CONFIG_MMU */
-
-#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
-
-#ifndef __PAGETABLE_P4D_FOLDED
-int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot);
-int p4d_clear_huge(p4d_t *p4d);
-#else
-static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
-{
-	return 0;
-}
-static inline int p4d_clear_huge(p4d_t *p4d)
-{
-	return 0;
-}
-#endif /* !__PAGETABLE_P4D_FOLDED */
-
-int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
-int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot);
-int pud_clear_huge(pud_t *pud);
-int pmd_clear_huge(pmd_t *pmd);
-int p4d_free_pud_page(p4d_t *p4d, unsigned long addr);
-int pud_free_pmd_page(pud_t *pud, unsigned long addr);
-int pmd_free_pte_page(pmd_t *pmd, unsigned long addr);
-#else	/* !CONFIG_HAVE_ARCH_HUGE_VMAP */
-static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
-{
-	return 0;
-}
-static inline int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
-{
-	return 0;
-}
-static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
-{
-	return 0;
-}
-static inline int p4d_clear_huge(p4d_t *p4d)
-{
-	return 0;
-}
-static inline int pud_clear_huge(pud_t *pud)
-{
-	return 0;
-}
-static inline int pmd_clear_huge(pmd_t *pmd)
-{
-	return 0;
-}
-static inline int p4d_free_pud_page(p4d_t *p4d, unsigned long addr)
-{
-	return 0;
-}
-static inline int pud_free_pmd_page(pud_t *pud, unsigned long addr)
-{
-	return 0;
-}
-static inline int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
-{
-	return 0;
-}
-#endif	/* CONFIG_HAVE_ARCH_HUGE_VMAP */
-
-#ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-/*
- * ARCHes with special requirements for evicting THP backing TLB entries can
- * implement this. Otherwise also, it can help optimize normal TLB flush in
- * THP regime. stock flush_tlb_range() typically has optimization to nuke the
- * entire TLB TLB if flush span is greater than a threshold, which will
- * likely be true for a single huge page. Thus a single thp flush will
- * invalidate the entire TLB which is not desitable.
- * e.g. see arch/arc: flush_pmd_tlb_range
- */
-#define flush_pmd_tlb_range(vma, addr, end)	flush_tlb_range(vma, addr, end)
-#define flush_pud_tlb_range(vma, addr, end)	flush_tlb_range(vma, addr, end)
-#else
-#define flush_pmd_tlb_range(vma, addr, end)	BUILD_BUG()
-#define flush_pud_tlb_range(vma, addr, end)	BUILD_BUG()
-#endif
-#endif
-
-struct file;
-int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
-			unsigned long size, pgprot_t *vma_prot);
-
-#ifndef CONFIG_X86_ESPFIX64
-static inline void init_espfix_bsp(void) { }
-#endif
-
-extern void __init pgtable_cache_init(void);
-
-#ifndef __HAVE_ARCH_PFN_MODIFY_ALLOWED
-static inline bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot)
-{
-	return true;
-}
-
-static inline bool arch_has_pfn_modify_check(void)
-{
-	return false;
-}
-#endif /* !_HAVE_ARCH_PFN_MODIFY_ALLOWED */
-
-/*
- * Architecture PAGE_KERNEL_* fallbacks
- *
- * Some architectures don't define certain PAGE_KERNEL_* flags. This is either
- * because they really don't support them, or the port needs to be updated to
- * reflect the required functionality. Below are a set of relatively safe
- * fallbacks, as best effort, which we can count on in lieu of the architectures
- * not defining them on their own yet.
- */
-
-#ifndef PAGE_KERNEL_RO
-# define PAGE_KERNEL_RO PAGE_KERNEL
-#endif
-
-#ifndef PAGE_KERNEL_EXEC
-# define PAGE_KERNEL_EXEC PAGE_KERNEL
-#endif
-
-/*
- * Page Table Modification bits for pgtbl_mod_mask.
- *
- * These are used by the p?d_alloc_track*() set of functions an in the generic
- * vmalloc/ioremap code to track at which page-table levels entries have been
- * modified. Based on that the code can better decide when vmalloc and ioremap
- * mapping changes need to be synchronized to other page-tables in the system.
- */
-#define		__PGTBL_PGD_MODIFIED	0
-#define		__PGTBL_P4D_MODIFIED	1
-#define		__PGTBL_PUD_MODIFIED	2
-#define		__PGTBL_PMD_MODIFIED	3
-#define		__PGTBL_PTE_MODIFIED	4
-
-#define		PGTBL_PGD_MODIFIED	BIT(__PGTBL_PGD_MODIFIED)
-#define		PGTBL_P4D_MODIFIED	BIT(__PGTBL_P4D_MODIFIED)
-#define		PGTBL_PUD_MODIFIED	BIT(__PGTBL_PUD_MODIFIED)
-#define		PGTBL_PMD_MODIFIED	BIT(__PGTBL_PMD_MODIFIED)
-#define		PGTBL_PTE_MODIFIED	BIT(__PGTBL_PTE_MODIFIED)
-
-/* Page-Table Modification Mask */
-typedef unsigned int pgtbl_mod_mask;
-
-#endif /* !__ASSEMBLY__ */
-
-#ifndef io_remap_pfn_range
-#define io_remap_pfn_range remap_pfn_range
-#endif
-
-#ifndef has_transparent_hugepage
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-#define has_transparent_hugepage() 1
-#else
-#define has_transparent_hugepage() 0
-#endif
-#endif
-
-/*
- * On some architectures it depends on the mm if the p4d/pud or pmd
- * layer of the page table hierarchy is folded or not.
- */
-#ifndef mm_p4d_folded
-#define mm_p4d_folded(mm)	__is_defined(__PAGETABLE_P4D_FOLDED)
-#endif
-
-#ifndef mm_pud_folded
-#define mm_pud_folded(mm)	__is_defined(__PAGETABLE_PUD_FOLDED)
-#endif
-
-#ifndef mm_pmd_folded
-#define mm_pmd_folded(mm)	__is_defined(__PAGETABLE_PMD_FOLDED)
-#endif
-
-/*
- * p?d_leaf() - true if this entry is a final mapping to a physical address.
- * This differs from p?d_huge() by the fact that they are always available (if
- * the architecture supports large pages at the appropriate level) even
- * if CONFIG_HUGETLB_PAGE is not defined.
- * Only meaningful when called on a valid entry.
- */
-#ifndef pgd_leaf
-#define pgd_leaf(x)	0
-#endif
-#ifndef p4d_leaf
-#define p4d_leaf(x)	0
-#endif
-#ifndef pud_leaf
-#define pud_leaf(x)	0
-#endif
-#ifndef pmd_leaf
-#define pmd_leaf(x)	0
-#endif
-
-#endif /* _ASM_GENERIC_PGTABLE_H */